Why are there multiple authentication failures from Unix source for an account?

Path Finder

Dear All

I agree that this may not be the right forum to post this.

There are a lot of authentication failures for some accounts and the sources are two Linux servers. Checked with the user, they didn't enter incorrect credentials these many times. For sure, this is some process or job. However, I would like to understand why are these attempts failing. And if these are counted as failed attempts, why these attempts don't lock out the account (considering we have an account lock-out policy)

Can someone help me to understand how are these attempts generated?

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